Witnesses may report an exchange of fire.Logical formLearned from21 sentences. (Gunfire exchanges) may continue.Logical formLearned from21 sentences. Exchange can be for (wage cuts).Logical formLearned from21 sentences. (Exchange rate movements) can be adverse.Logical formLearned from21 sentences. An (exchange operator) may pertain-to a world-city.Logical formLearned from21 sentences. An exchange can be combative.Logical formLearned from21 sentences. Exchange can be for privacy.Logical formLearned from21 sentences. Exchange can be for access.Logical formLearned from21 sentences. (Security assurances) can be in exchange.Logical formLearned from21 sentences. Exchange can be for a return of some lands.Logical formLearned from21 sentences. Exchange can be for a promise of peace.Logical formLearned from21 sentences. Exchanges of fire may be reported.Logical formLearned from21 sentences. (Field goals) may undergo an exchange.Logical formLearned from21 sentences. Exchange can be for prisoners of war.Logical formLearned from21 sentences. Exchange can be for recognition of sovereignty.Logical formLearned from21 sentences.